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公开(公告)号：JPH11218967A
公开(公告)日：1999-08-10
申请号：JP2313098
申请日：1998-02-04
Applicant: TORAY INDUSTRIES
Inventor： TAKAHATA HIROYUKI , NAGASE KOICHI , ISHIYAMA MASAAKI
Abstract: PROBLEM TO BE SOLVED: To provide a positively chargeable electrostatic latent image developing toner which produces no white speckles and to provide an electrophotographic developer. SOLUTION: This electrostatic charge image developing toner consists of at least a binder resin, a coloring agent and silica particles. The silica particles have 0.1 to 2 μm average particle size measured by a centrifugal sedimentation method. The electrophotographic developer consists of toner particles comprising at least a binder resin and a coloring agent, silica particles having 0.1 to 2 μm average particle size measured by a centrifugal sedimentation method of silica particles, and carrier particles. This developer is controlled in such a manner that the electrification sequence of the constituent particles is made of, from the lower side, carrier particles, toner particles and silica particles.
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公开(公告)号：JPH11202562A
公开(公告)日：1999-07-30
申请号：JP548698
申请日：1998-01-14
Applicant: TORAY INDUSTRIES
Inventor： TSUCHIMOTO TATSURO , YOKOYAMA KYOKO , NAGASE KOICHI
Abstract: PROBLEM TO BE SOLVED: To obtain liquid developer which does not cause the deterioration of printing quality even on a condition that ambient humidity is high by using a colorant whose coefficient of moisture absorption is equal to or under a specified value. SOLUTION: In a process where an electrostatic latent image on an electrostatic latent image carrier is developed and a developed image developed by such development is transferred to a body to be transferred; an environmental condition largely influences the printing quality. Especially, when the ambient humidity is high, the developing performance of toner particles, the transfer performance of a toner image and reverse transfer performance that the toner image transferred to the body to be transferred once is restored to the electrostatic latent image carrier are influenced, so that printing deterioration such as the lowering of printing density and the deterioration of the uniformity of a solid part is caused. By using a colorant whose coefficient of moisture absorption is =100 and specific surface area is /g as the colorant.
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公开(公告)号：JPH11184164A
公开(公告)日：1999-07-09
申请号：JP35716697
申请日：1997-12-25
Applicant: TORAY INDUSTRIES
Inventor： NAGASE KOICHI , TSUCHIMOTO TATSURO , TAIRA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To provide the electrostatic latent image developing toner composition prevented from occurrence of filming and having a long running life. SOLUTION: The electrophotographic developer comprises at least toner particles composed of at least a binder resin and a magnetic material, inorganic particles, organic particles, carrier particles and the electrification order of these constituent particles are heighted in the order of the organic particles, the carrier particles, the toner particles, and the inorganic particles.
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公开(公告)号：JPH1138686A
公开(公告)日：1999-02-12
申请号：JP19834897
申请日：1997-07-24
Applicant: TORAY INDUSTRIES
Inventor： TSUCHIMOTO TATSURO , YOKOYAMA KYOKO , NAGASE KOICHI
Abstract: PROBLEM TO BE SOLVED: To provide a liq. developer giving satisfactory printed matter with high reproducibility even after repeated printing by using a colorant having a specified solvent resistance to xylene. SOLUTION: Colored particles consisting essentially of a pigment and a resin are dispersed by 0.1-20 wt.% in a petroleum hydrocarbon as a carrier liq. The amt. of the pigment in the colored particles is 5-30 wt.%, preferably 10-25 wt.%. The bonding resin is, e.g. alkyd resin, styrene resin, phenolic resin, acrylic resin, styrene-acrylic resin, polyester resin, rosin modified phenolic resin or a rosin modified resin and this rosin modified resin is preferably used. The solvent resistance of the colorant to xylene is >3, preferably >4. The average particle diameter of the colored particles is 0.3-5 μm, preferably 0.5-3 μm.
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公开(公告)号：JPH10288893A
公开(公告)日：1998-10-27
申请号：JP9923497
申请日：1997-04-16
Applicant: TORAY INDUSTRIES
Inventor： YAMADA HISAYOSHI , NAGASE KOICHI , YOSHIDA TOMOYUKI
Abstract: PROBLEM TO BE SOLVED: To improve printing durability and printing density mottle by composing the transfer layer of an intermediate transfer body of silicone rubber including a conductive filler. SOLUTION: The transfer layer of this intermediate transfer body is composed of the silicone rubber including the conductive filler. It is preferable that as the amount of the conductive filler included in the silicone rubber, the conductive filler is 20 pts.wt. =0.01 μm and a ratio obtained by dividing the minor axis diameter by a major axis diameter is 2
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Patent Agency Ranking
公开(公告)号：JPH10282718A
公开(公告)日：1998-10-23
申请号：JP8271797
申请日：1997-04-01
Applicant: TORAY INDUSTRIES
Inventor： NAGASE KOICHI , NAKAJO YOSHIHIRO , ISHIYAMA MASAAKI
Abstract: PROBLEM TO BE SOLVED: To provide an image forming method for preventing falsification, with excellent workability by coloring the surroundings of a printing part with a coloring component included in toner. SOLUTION: In the case of forming an image on a printed material, the surroundings of the printing part are colored by the coloring component included in the toner. By this constitution, the surroundings of the printing part of the printed material are colored so that even if toner grains are physically removed to attempt the falsification of the numbers of securities, etc., in the case the fixation of toner powder is insufficient, evidence of printing is left because a surrounding part is colored, to prevent such an illegal falsification. As the printed material, an arbitrary one can be used. In other words, a special limit is not set but preferably a sheet of paper is used. Further, as the surroundings, normally most of the surroundings of the printing part are mentioned but it is good that the surroundings of at least a part of the printing part are obtained. Further, as the image forming method, it is preferable that an electrophotographic method can be used.
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公开(公告)号：JPH10186865A
公开(公告)日：1998-07-14
申请号：JP29706397
申请日：1997-10-29
Applicant: TORAY INDUSTRIES
Inventor： ASADA HIROYOSHI , TAMURA YOSHIHIRO , NAGASE KOICHI , NOURA TAKAHIRO , TSUCHIMOTO TATSURO , YOKOYAMA KYOKO
Abstract: PROBLEM TO BE SOLVED: To transfer image-deterioration free toner-image by having a developing means which forms a toner image from a latent image on an image carrier by the use of liquid developer containing toner particles whose charge hold rate has a specific value or above, and a means which transfers the toner image to a transfer material from the image carrier. SOLUTION: On the surface of the photoreceptor 2 the electrostatic latent image is formed with light emitted from an exposure means. A developing means 8 has a first developing unit 8a - a fourth developing unit 8d. In the first developing unit 8a for example, a developing roller 13a and a main squeeze roller 14a are arranged parallel with each other in a liquid vessel 25a holding the liquid developer containing the toner particles having a charge hold rate of 50% or more. At the development time, the developing units 8a-8d are moved one after another in that order to a latent-image formation means 27 by a drive means, electrostatic latent images are formed successively based on information on print subjected to color separation, and they are transferred onto the recording material 6 held on a transfer drum 3.
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公开(公告)号：JPH10186734A
公开(公告)日：1998-07-14
申请号：JP29706197
申请日：1997-10-29
Applicant: TORAY INDUSTRIES
Inventor： TSUCHIMOTO TATSURO , NAGASE KOICHI , NOURA TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of an image run on a transfer body to enhance the printing density in a liquid developer in which a toner grain containing at least a binder resin and a coloring agent is dispersed in a dispersing medium, SOLUTION: In a liquid developer in which a toner grain containing at least a binder resin and a coloring agent is dispersed in a dispersing medium, AC conductivity IA, toner charge Q/M per unit weight, and weight average grain size DV satisfy IA>5 (pS/cm), Q/M>30 (μC/g), and 0.1
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公开(公告)号：JPH10133429A
公开(公告)日：1998-05-22
申请号：JP28811996
申请日：1996-10-30
Applicant: TORAY INDUSTRIES
Inventor： NOURA TAKAHIRO , NAGASE KOICHI , TSUCHIMOTO TATSURO
Abstract: PROBLEM TO BE SOLVED: To obtain a liq. developer stably giving a satisfactory printed matter free from image blurring, by specifying the electric charge retentivity of colored particles consisting of a resin and a colorant when the colored particles are dispersed in an insulating liq. to produce a liq. developer. SOLUTION: When colored particles consisting of a resin and a colorant are dispersed in an insulating liq. to produce a liq. developer, the electric charge retentivity of the colored particles is regulated to >=50%, preferably >=70%. In the case of =10pS/cm. In the case of
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公开(公告)号：JPH09329970A
公开(公告)日：1997-12-22
申请号：JP15242796
申请日：1996-06-13
Applicant: TORAY INDUSTRIES
Inventor： YOSHIDA TOMOYUKI , YAMADA HISAYOSHI , NAGASE KOICHI
Abstract: PROBLEM TO BE SOLVED: To prevent an image flow and destruction, and to realize a stable transfer ratio and an excellent separation performance of a transferred material after transferring-fixing by composing an intermediate transfer body with a transfer layer and the conductive layer, and adopting silicone rubber as the transfer layer. SOLUTION: This intermediate transfer body is composed of at least, two layers of the transfer layer and the conductive layer, and the transfer layer is the silicone rubber with equal to or beyond 35 and equal to or below 80 JIS-A hardness. As the silicone rubber adopted for the transfer layer for instance, the heat flow type silicone rubber, the liquid silicone rubber, the low temp. hardening type silicone rubber or the room temp. hardening type silicone rubber can be preferably adopted. The liquid type silicone rubber which can be easily formed by heating the two liquid after mixing them and is provided with high productivity is more preferable. The more over preferable hardness of the silicone rubber of this transfer layer is equal to or beyond 40 and equal to or below 70 JIS-A hardness. Further more, the filler can be added to the transfer layer for the purpose of improving the mechanical strength and adjusting electrostatic property.
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